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