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