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