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