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