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