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)(17,18,23,28)(19,29,31,24)(20,33,32,25)(21,26,38,44)(22,27,34,40)(30,45,47,39)(35,42,36,41)(37,43,46,48)(2,5)(6,8)(17,19,23,31)(18,24,28,29)(20,34,32,22)(21,36,38,35)(25,40,33,27)(26,42,44,41)(30,46,47,37)(39,48,45,43)(9,11,12,16)(10,13,14,15)(17,20,22,19,23,32,34,31)(18,25,27,24,28,33,40,29)(21,35,37,30,38,36,46,47)(26,41,43,39,44,42,48,45)(17,21,34,46,23,38,22,37)(18,26,40,48,28,44,27,43)(19,30,20,35,31,47,32,36)(24,39,25,41,29,45,33,42)(1,3,4,7)(2,6,5,8)(17,22,23,34)(18,27,28,40)(19,20,31,32)(21,37,38,46)(24,25,29,33)(26,43,44,48)(30,35,47,36)(39,41,45,42)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.