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