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