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