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