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