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