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