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