Also curious about how to set individual tag colors in graph view, as shown in the Announcement of v0.9.0:
https://forum.obsidian.md/t/obsidian-release-v0-9-0-insider-build/5975
I was trying to achieve the same tag display in edit, preview, tag pane and graph view, both for overall tags and for some individual tags. However, from the post below, it seems that setting individual tag colors in tag pane has not been supported yet.
It would be really awesome if this can be achieved someday.