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