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