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