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