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