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