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