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)(29,44)(30,39)(32,43)(33,47)(34,41)(35,42)(36,48)(38,46)(40,45)(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)(26,43,37,28)(34,45,36,46)(41,44,48,47)(1,3,4,8)(2,5,6,7)(10,13)(14,16)(17,20)(18,25)(19,29)(21,34)(22,36)(23,35)(24,38)(26,41)(27,42)(28,44)(30,45)(31,46)(32,33)(37,48)(39,40)(43,47)(10,13)(14,16)(17,21,23,22)(18,26,27,37)(19,30,32,31)(20,34,35,36)(24,28,39,43)(25,41,42,48)(29,45,33,46)(38,44,40,47)(9,11,12,15)(10,14,13,16)(18,27)(20,35)(24,39)(26,37)(28,43)(29,33)(34,36)(45,46)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.