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