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