What kind of visualization do you need to do? For basic graphs, such as traffic growth, year on year growth, and more I use Excel. It depends on who you're reporting to, but you can usually define down the variables that matter to the company and visualize them on one dashboard.

If all of your data is within Google Analytics, you can build a full dashboard within Analytics to show your top-line metrics, but this usually doesn't provide the granularity of data that you need to see.

Finally, there are multiple tools for data vis depending on your need. Gephi for visualizing large sets of data, multiple tools like visual.ly for making infographics, and of course a myriad of freelancers out there to visualize your data for you if you need to make it actionable and presentable.

Hope this helps. Feel free to contact me if you need more info!