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