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