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