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