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