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