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