One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(18,22)(20,28)(23,29)(24,30)(25,31)(27,32) involution — undirected(2,5)(6,8)(9,10)(11,15)(12,14)(13,16)(18,23)(22,29)(24,25)(30,31) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,18,21,23)(19,25,26,24)(20,29,28,22)(27,30,32,31)(1,3,4,7)(2,6,5,8)(11,16)(13,15)(17,19)(18,24)(20,27)(21,26)(22,30)(23,25)(28,32)(29,31)(10,14)(13,15)(19,26)(24,25)(27,32)(30,31) 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.