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