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