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