The Tag Icons theme-component allows configuring tags to be displayed with an icon, and an optional color. I really think this feature makes a difference, especially when you have to manage too many tags.
In my case, using the color for the text as well as for the icon, and adding a background-color would increase the visibility, and provide a better sense of separation from rest of the tags, and tag-groups.
I pushed a pull request to share how I think it could work.
https://github.com/discourse/discourse-tag-icons/pull/46
Tag style: simple
Tag style: bullet
Tag style: box
