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