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