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