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