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