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