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