Just as $\ce{NaCl}$ would look like this:
What would a diagram of $\ce{CuSO4}$ look like?
Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. It only takes a minute to sign up.
Sign up to join this communityFrom the WebElements.com page on copper sulphate, the metal lattice structure looks like:
The yellow pyramids are cooper and the other structures are sulphates.
An alternate view comes from the Wikipedia page of copper (II) sulphate:
The pink spheres represent copper, yellow are sulphur and red are oxygen.
Below is a 2D representation of copper sulphate, from the Royal Society of Chemistry
A similar question with some more insight is found in How do copper sulphate and the like change crystal structure on adding water of hydration?