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