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