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