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