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