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