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