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