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