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