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