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