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