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