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