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