(Shouldn't "taxons" be "taxa"?) The URL of the corresponding map is given in the <url> tag. Append this to "http://data.gbif.org/, and you have the URL for the image of the map. For example, here's the map for Apus apus.
I've added code to do this to iSpecies, so it now features maps from from GBIF. I've also finally tweaked the Google code to stop mangling UTF-8 characters.