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