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