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