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