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