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