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