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