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