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