I'm halfway there please see the edit

OK here's my problem, I'm generating a graph of a python module, including all the files with their functions/methods/classes.

I want to arrange it so, that nodes gather in circles around their parent nodes, currently everything is on one gargantuan horizontal row, which makes the thing >50k pixels wide and also let's the svg converter fail(only renders about the half of the graph).

I went through the docs but couldn't find anything that seems to do the trick.

So the question is:
Is there a simple way to do this or do I have to layout the whole thing by myself? :/

EDIT:
Thanks to Andrews comment I've got the right layout, the only problem now is that it's a bit to "compact"... so the question now is, how to fix this?

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