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