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