This is a drawing of the transition from the atmosphere to the interior.
Click on image for full size
NASA
The Layers of Saturn's Interior
There is no surface to the giant planets, only a gradual change from the atmosphere, as shown in this drawing.
The gases which Saturn is mostly made of change to liquid inside Saturn, but the change is very slow. This means that the giant planets do not have real layers on the inside, as the earth-like planets do.
The liquid sections of Saturn are the biggest parts of the planet and go down very deep (the liquid is not made of water!). The first liquid layer inside Saturn, right under the atmosphere, is the liquid hydrogen layer. Under the liquid hydrogen layer is a liquid metallic hydrogen layer.
At the deepest part of Saturn is the core.
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