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