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