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