One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,10,6,9,4,8)(3,11,12,16,13,7,14,15)(17,18)(19,23)(20,22)(21,24)(25,28)(26,30)(27,29)(31,32)(1,3,6,13)(2,7,9,11)(4,12,5,14)(8,15,10,16)(18,22)(20,28)(23,29)(24,25)(27,32)(30,31)(1,4,6,5)(2,8,9,10)(3,12,13,14)(7,15,11,16)(17,19,21,26)(18,23,24,30)(20,27,28,32)(22,29,25,31)(19,26)(23,30)(27,32)(29,31) involution — undirected(2,9)(7,11)(8,10)(15,16)(18,24)(22,25)(23,30)(29,31) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.