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