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