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