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