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