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