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