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