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