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