Software for generating Cayley graphs of $\mathbb Z_n$? Does it exist any program (for linux) which can generate a nice Cayley graph of any $\mathbb Z_n$? (If it's possible to create such a graph at all, that is.)
(where perhaps $n ≤ 100$ or something like that)

In SageMath: g=graphs.CirculantGraph(8,[1,4,7])
First argument is the number of vertices, second is the connection set. Now
g.show() produces a drawing.
