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