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