Do minors and/or non-major courses affect grad school admissions? Basically what it says in the heading, lengthy explanation below

At my university, just completing your major and general ed courses won't get you enough credits to graduate. This means that we have to either complete a minor (6 courses) or just take courses from other fields. Up until now I have just been taking courses that I thought were interesting, in a variety of fields, none of which have much, if anything, to do with my major (which is psychology). 
Minors don't show on the degree certificate - they're technically unofficial and you can only tell by going through the transcript that somebody's completed one. Al

the only two fields available at my university that have any real connection to psych are bio and computer science. The bio curriculum has next to nothing to do with psych though, except two courses which I am taking anyway. Judging from my experience in high school, I have no aptitude and not too much interest in CS. I could get a minor in sociology, which I do enjoying, but I don't plan to pursue social psych later on.

I'm sorry this has been so long. Basically, would it be advisable to minor in something related to psychology in order to boost my chances at grad school? Or is it okay if I finish my psychology requirements and electives and then just take other courses that I find interesting?

I'm an undergraduate, currently in the middle of my second year, so I still have time to finish a minor before I graduate and I'm very confused about everything.
I don't think most schools will know or care about the nuances of the Sahana U minor system.  Ergo, do what you want.  

Since many schools don't require a minor at all, they won't worry about if you do the extra classes in history or math or basketweaving.  They will just look to see that you are a psych major, what GPA you have, standardized test scores, essay, letter.  

It's extremely unlikely that the content of those 6 diversification courses will affect any decisions.  Just concentrate on doing well with whatever you do.  And take what you like.  The major is already covering key content needed for grad school.