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