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