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