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