Why Only Saturn Has Visible Rings
By "visible to the naked eye", I take it you mean "visible from Earth with a small telescope".

Saturn's rings are largely water ice, and so they reflect more sunlight back to us.

Jupiter's rings, have lower proportions of ice, and lots of smaller dust particles that tend to scatter light forward rather than back to us.

The ring systems of Uranus and Neptune are made of really dark material, so also don't reflect much light in our direction.