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