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