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