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)(11,17)(12,13)(14,22)(15,16)(18,23)(19,21)(20,24)(25,26)(27,28)(29,37)(30,31)(32,39)(33,34)(35,38)(36,40)(3,7)(5,8)(9,11,15,12)(10,13,16,17)(14,19,23,20)(18,21,22,24)(25,27)(26,28)(29,35)(30,33)(31,34)(32,36)(37,38)(39,40)(1,2)(3,5)(4,6)(7,8)(10,16)(13,17)(18,22)(21,24)(26,31)(27,33)(32,37)(35,40) involution — undirected(9,12,15,11)(10,17,16,13)(14,19,23,20)(18,21,22,24)(25,28)(26,27)(29,38)(30,34)(31,33)(32,40)(35,37)(36,39)(1,3)(2,5)(4,7)(6,8)(9,13,15,17)(10,12,16,11)(14,21,23,24)(18,20,22,19)(25,26)(27,34)(28,33)(29,32)(30,31)(35,38)(36,40)(37,39)(1,2)(3,5)(4,6)(7,8)(9,14)(10,18)(11,19)(12,20)(13,21)(15,23)(16,22)(17,24)(25,29)(26,32)(27,35)(28,36)(30,39)(31,37)(33,40)(34,38) 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.