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