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