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