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