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