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