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