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)(11,15)(12,14)(13,16)(17,18,23,28)(19,24,31,40)(20,25,36,45)(21,26,22,27)(29,38,33,42)(30,39,37,46)(32,41,47,48)(34,43,35,44)(2,5)(6,8)(9,11,12,16)(10,13,14,15)(17,19)(18,24)(20,32)(21,30)(22,37)(23,31)(25,41)(26,39)(27,46)(28,40)(29,35)(33,34)(36,47)(38,44)(42,43)(45,48)(1,3,4,7)(2,6,5,8)(10,14)(11,16)(17,19)(18,24)(20,33)(21,37)(22,30)(23,31)(25,42)(26,46)(27,39)(28,40)(29,36)(32,34)(35,47)(38,45)(41,43)(44,48)(10,14)(13,15)(17,20,22,35,23,36,21,34)(18,25,27,44,28,45,26,43)(19,29,30,32,31,33,37,47)(24,38,39,41,40,42,46,48)(2,5)(6,8)(10,14)(13,15)(17,21,23,22)(18,26,28,27)(19,30,31,37)(20,34,36,35)(24,39,40,46)(25,43,45,44)(29,32,33,47)(38,41,42,48)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.