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)(19,28,29,23)(20,25,32,40)(22,24,34,27)(30,41,42,36)(31,35,43,37)(33,38,45,39)(44,46,48,47)(1,3,4,8)(2,5,6,7)(10,13)(11,15)(17,19)(18,23)(20,30)(21,29)(22,31)(24,37)(25,36)(26,28)(27,35)(32,42)(33,44)(34,43)(38,47)(39,46)(40,41)(45,48)(9,10)(11,14)(12,13)(15,16)(18,24)(19,29)(20,32)(22,34)(23,35)(25,39)(26,27)(28,37)(36,47)(38,40)(41,46)(44,48) involution — undirected(3,8)(5,7)(10,13)(14,16)(17,20,21,32)(18,25,26,40)(19,30,29,42)(22,33,34,45)(23,36,28,41)(24,38,27,39)(31,44,43,48)(35,46,37,47)(9,11,12,15)(10,14,13,16)(19,29)(20,32)(23,28)(25,40)(31,43)(33,45)(35,37)(38,39)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.