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