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