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