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