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