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