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