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