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