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