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