Sound is invisible waves travelling through the air. To draw them, we'll make them visible, and to make it clear that these are sound waves, we'll draw a speaker they come out of.
A speaker has a magnet and a coil. Electricity runs through the coil, which makes it move relative to the magnet and drag the cone along with it, and the cone moves the air, which is what makes the sound waves.
You can't see the coil in the picture, it's inside. The magnet is the black ring on the left, and the cone is the inner surface of the speaker basket.