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