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