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