One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(17,18,23,21)(19,24,22,30)(20,27,29,32)(25,28,31,26)(2,5)(6,8)(9,10)(11,15)(12,14)(13,16)(17,19,23,22)(18,24,21,30)(20,28,29,26)(25,27,31,32)(9,11)(10,13)(12,16)(14,15)(17,20)(18,25)(19,26)(21,31)(22,28)(23,29)(24,32)(27,30) involution — undirected(1,3,4,7)(2,6,5,8)(11,16)(13,15)(17,21,23,18)(19,24,22,30)(20,25,29,31)(26,27,28,32)(10,14)(13,15)(17,19,23,22)(18,24,21,30)(20,26,29,28)(25,32,31,27)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.