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