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