The extension doesn't show swatches on category page
As far as you faced such problem while using Color Swatches Pro module, perhaps, there is no 'Add to Cart' button in your Magento theme. As a consequence, there are no swatches on category page.
To solve the problem, open
Admin panel/System/Configuration/Amasty Extensions/Color Swatches Pro/Advanced settings
and perform the actions that are shown on the picture: