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