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)(11,17)(12,14)(13,16)(15,19)(18,24)(20,22)(21,23)(26,31)(29,40)(32,39)(33,35)(3,7)(5,8)(9,11)(10,15)(12,17)(13,18)(14,19)(16,23)(20,24)(21,22)(26,31)(28,37)(32,39)(34,38) involution — undirected(1,2)(3,5)(4,6)(7,8)(25,26)(27,32)(28,33)(29,34)(30,31)(35,37)(36,39)(38,40) involution — undirected(9,12,14,10)(11,17,19,15)(13,16,22,20)(18,23,21,24)(25,27,30,36)(26,32,31,39)(28,38,37,34)(29,33,40,35)(1,3)(2,5)(4,7)(6,8)(9,13,14,22)(10,16,12,20)(11,18,19,21)(15,23,17,24)(25,28)(26,33)(27,34)(29,32)(30,37)(31,35)(36,38)(39,40)(1,2)(3,5)(4,6)(7,8)(9,11)(10,17)(12,15)(13,21)(14,19)(16,23)(18,22)(20,24)(25,29)(26,34)(27,35)(28,39)(30,40)(31,38)(32,37)(33,36) involution — undirectedA 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.