Depends what you mean by editable. If you want to be able to move spiral arms around, then I've never seen one like that. If you want one where the labels can be changed, then yes, that's possible but most of them are one-layer .png files so would involve quite a bit of work.Is there an editable map of the milky way galaxy?
For example, this is a good labelled map on wiki commons: https://commons.wikimedia.org/wiki/File:Milky_way_map.png?uselang=en-gb.
There is one .svg file also on wiki commons which would allow you to change labels, etc much more easily (with inkscape or similar) (and it's in the public domain, so no copyright/acknowledgement issues) - but the base image is still a raster image: https://commons.wikimedia.org/wiki/File:Milky_Way_Arms_ssc2008-10.svg?uselang=en-gb.