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