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