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