How to justify quitting PhD because of a professor in statement of purpose? I planning to drop out of a PhD program after one semester because of my encounter with a professor with little experience.

This professor is also very intervening, non-perceptable, unapproachable, and worst of all, willing to go to any extent to sabotage my career.

The advisor altered credits of some courses to make sure that even though I got As in those courses, they will have a tiny efect on my cumulative average grade. 
Obviously, when I apply for another university, the fact that I've quit and my average grade will raise some questions. 

So, what can I say in my statement of purpose that will put my quitting in the best possible light?
I planning to drop out of a PhD program after one semester and apply
to another top university for a PhD program.

Not all universities allow applicants from current Ph.D students. Although not 'illegal' it is looked down upon based on the requirements that I've seen thus far in my applications. Also try to finish the year at the very least. Perhaps your struggles are due to you trying to adjust to a new environment rather than the institution itself.

This is because of my encounter with a professor with little
experience and who is very intervening, non-perceptable,
unapproachable and worst of all willing to go to any extent to sabotage your career.

You mentioned a number of extremely negative attributes. Have you tried to talk to this individual about your reaction to their actions? If so, don't you have alternative options within the university? As in, changing advisers? Your judgement of a professor after one semester as inexperienced, micromanaging, unintelligible, hostile, and malicious seems rather premature.

The advisor meddled with credits to make sure that I cannot be in good
academic standing even though I got A's in courses.

Perhaps this is my lack of experience, but professors can only give grades to their class. The assignment of credits for different classes are determined well before you matriculated to the university. In other words, the class credit was predetermined when you signed up. At the same time, unless the same professor taught all of your classes, I don't see how it could have affected your academic standing. If you got all A's then the connection doesn't make sense.

Obviously, I have to submit my transcripts from all universities, and
my quitting and grade will raise some questions. So, what can I say in
my statement of purpose (or anywhere, I suppose) that will put my
quitting in the best possible light?
Thanks in advance for all your help!

I say don't quit, yet. Finish the year before making drastic actions such as this.
The evidence you've provided thus far are self-contradictory and doesn't seem to lend the idea that you tried to resolve the issue within your dept. If you did, then within the institution as mentioned by Mohammad Ghassemi. See if you can sign up with another adviser. You are running away from the problem rather than addressing it rationally.