Network models have been very useful for analyzing problems involving telecommunications, supply chains, vehicle routing, and other areas. In this paper I discuss the importance of visualization for network optimization. Reasons include explaining the model to non-technical managers and obtaining better solutions for the network model. Better solutions can be a direct result of visualization (when human intuition identifies a solution from the network picture) or an indirect result (when human intuition identifies improved procedures in algorithmic design, which then result in superior solutions). I discuss the importance of Visual Basic for Applications (VBA) for drawing networks directly within Microsoft Excel. I show how to use VBA efficiently to draw these networks using various Excel drawing objects.