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