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