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