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