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