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