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