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