What is phosphate's electron configuration?

There are $5 + 4 \times 6 + 3 = 32 \text{ valence electrons}$ for $P {O}_{4}^{3 -}$, and a formal Lewis structure of $O = P {\left(- {O}^{-}\right)}_{3}$ is proposed. What is your prediction with respect to the structure of the phosphate ion?
Note that when we titrate phosphporic acid ${H}_{3} P {O}_{4}$ with sodium hydroxide, we get mainly $H P {O}_{4}^{2 -}$ at the endpoint in aqueous solution.