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