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)(17,18,21,25)(19,27,30,23)(20,32,34,24)(22,26,36,42)(28,37,33,40)(29,39,31,38)(35,45,46,41)(43,47,44,48)(2,6)(7,8)(9,11,12,16)(10,13,14,15)(17,19)(18,23)(20,33)(21,30)(22,29)(24,40)(25,27)(26,38)(28,34)(31,36)(32,37)(35,44)(39,42)(41,48)(43,46)(45,47)(1,3,5,4)(2,7,6,8)(10,14)(11,16)(17,20,21,34)(18,24,25,32)(19,28,30,33)(22,35,36,46)(23,37,27,40)(26,41,42,45)(29,43,31,44)(38,47,39,48)(1,3,5,4)(2,7,6,8)(10,14)(13,15)(19,29)(22,36)(23,38)(26,42)(27,39)(28,43)(30,31)(33,44)(35,46)(37,47)(40,48)(41,45)(1,4,5,3)(2,7,6,8)(10,14)(13,15)(18,25)(20,34)(23,27)(26,42)(28,33)(35,46)(38,39)(43,44)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.