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)(18,23)(19,20)(26,31)(28,29) involution — undirected(1,3,5,4)(2,6,7,8)(9,11,12,16)(10,13,14,15)(17,18)(19,27)(20,24)(21,23)(22,31)(25,29)(26,30)(28,32)(10,14)(11,16)(17,19,21,20)(18,24,23,27)(22,28,30,29)(25,26,32,31)(1,4,5,3)(2,6,7,8)(10,14)(13,15)(17,20,21,19)(18,25,23,32)(22,28,30,29)(24,26,27,31)(2,7)(6,8)(10,14)(13,15)(19,20)(24,27)(25,32)(28,29) 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.