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