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