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