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