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