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