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