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)(19,23)(20,27)(21,24)(22,25)(26,30)(28,29)(31,32) involution — undirected(1,3,7,4)(2,5,8,6)(9,10)(11,15)(12,14)(13,16)(17,19,22,27)(18,23,25,20)(21,29,31,26)(24,28,32,30)(1,4,7,3)(2,5,8,6)(9,11)(10,13)(12,16)(14,15)(17,20,27,18,22,23,19,25)(21,30,29,32,31,28,26,24)(1,5,7,6)(2,3,8,4)(11,16)(13,15)(17,21,22,31)(18,24,25,32)(19,26,27,29)(20,28,23,30)(1,6,7,5)(2,3,8,4)(10,14)(13,15)(21,31)(24,32)(26,29)(28,30)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.