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