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