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