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