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