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