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