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