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