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