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