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