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