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