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