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