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