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