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