One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(17,18,21,25,22,26,36,43)(19,27,30,38,29,42,35,23)(20,31,34,47,33,24,39,41)(28,45,46,37,32,44,48,40)(9,10,13,16)(11,15,12,14)(17,19,22,29)(18,23,26,38)(20,32,33,28)(21,35,36,30)(24,40,31,37)(25,42,43,27)(34,46,39,48)(41,44,47,45)(2,5)(6,8)(9,11,13,12)(10,14,16,15)(17,20,22,33)(18,24,26,31)(19,28,29,32)(21,34,36,39)(23,37,38,40)(25,41,43,47)(27,44,42,45)(30,46,35,48)(9,12,13,11)(10,15,16,14)(19,29)(23,38)(27,42)(28,32)(30,35)(37,40)(44,45)(46,48)(1,3,4,7)(2,6,5,8)(20,33)(24,31)(28,32)(34,39)(37,40)(41,47)(44,45)(46,48)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.