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