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