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