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