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