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