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