The central atom will use its s-orbital, its p-orbitals and as many of its d-orbitals as needed to mix together to make the hybrid orbitals. So, for XeOF4, Xe will need its s orbital, all three of its p-orbitals, and 2 of its d-orbitals, and its hybridization state will be sp3d2, or d2sp3.

There is another possible structure you can draw:

but this will still give you the same answer.