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