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