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The documentation is at

• http://doc.sagemath.org/html/en/reference/graphs/

and especially

• http://doc.sagemath.org/html/en/reference/graphs/sage/graphs/graph_generators.html

In particular the following generators exist:

sage: graphs(5)
<generator object GraphGenerators.__call__ at 0x...>
sage: graphs.nauty_geng("5")
<generator object GraphGenerators.nauty_geng at 0x...>
sage: graphs.nauty_geng("5 -c")
<generator object GraphGenerators.nauty_geng at 0x...>

and there are many more options to nauty's geng.