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