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