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