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)(11,16,14,29)(12,22,24,39)(13,25,28,38)(17,32,33,23)(19,21,35,27)(20,37,30,36)(26,31,40,34)(1,2)(3,7)(4,6)(5,8)(9,11,15,14)(10,16,18,29)(12,20,24,30)(13,21,28,27)(17,31,33,34)(19,25,35,38)(22,37,39,36)(23,26,32,40)(2,6)(5,7)(9,12,15,24)(10,17,18,33)(11,20,14,30)(13,26,28,40)(16,31,29,34)(19,36,35,37)(21,32,27,23)(22,38,39,25)(2,7)(3,8)(5,6)(10,18)(16,29)(17,33)(19,35)(22,39)(25,38)(31,34)(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.