Prove or disprove a FOL sentence using relevant domain diagrams: $\exists x (a.x\to b.x) \to (\forall x\,\, ax \to \exists b.x)$

Question

Prove or disprove the FOL sentence using relevant domain diagrams: $$\exists x (a.x\to b.x) \to (\forall x\,\, a.x \to \exists x\, b.x)$$

Can you suggest me a way to prove or disprove above two predicate expression using relevant domain diagrams containing elements with properties $a$ and $b$? Thanks in advance.