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