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