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