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