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