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