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