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