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