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