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