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