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