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