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