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