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