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