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