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