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