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