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