Agile Store Locator has builtin 9 styles of Google Maps which can be used on your Store Locator page, Admin can apply these settings from ASL Settings or shortcode attribute map_layout. If the provided styles don't fulfill the requirement, you can follow the steps to generate your own Google Maps style by following the steps.
Image of Snazzy Map Style
Image of Store Locator Public File
Once you apply the steps properly, you will see the Google Map of Store Locator with your own created style.