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