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