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