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