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