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)(11,12)(13,16)(14,22)(15,18)(17,23)(19,21)(20,24)(25,26,30,33)(27,31,34,28)(29,32,38,40)(35,39,37,36)(1,3,5,8)(2,6,7,4)(9,11,15,16)(10,12,18,13)(14,19,23,24)(17,20,22,21)(27,34)(28,31)(35,37)(36,39)(1,3)(2,4)(5,8)(6,7)(9,12,15,13)(10,16,18,11)(14,20,23,21)(17,24,22,19)(25,27)(26,31)(28,33)(29,37)(30,34)(32,36)(35,38)(39,40)(1,4)(2,3)(5,6)(7,8)(9,13,15,12)(10,16,18,11)(14,21,23,20)(17,24,22,19)(25,28,30,31)(26,27,33,34)(29,36,38,39)(32,35,40,37)(9,14,15,23)(10,17,18,22)(11,19,16,24)(12,20,13,21)(9,10)(11,12)(13,16)(14,17)(15,18)(19,20)(21,24)(22,23)(25,29)(26,32)(27,35)(28,36)(30,38)(31,39)(33,40)(34,37) 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.