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