The abscissa of the water vapor enthalpy-entropy diagram is the specific entropy, the ordinate is the specific enthalpy, and there are isotherms and isobars.

At any point, as long as you know two of P, T, and H, you can find S, or if you know P, T, and S, you can find H

If you can use software, I have a small software that can directly input the parameters and get them without looking up the table.