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