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