The colouring bit is harder and I don't know whether it's possible or
not.  I suggest you look at examples on the web, e.g.

http://gnuplot.sourceforge.net/demo/

to see if anything fits what you are trying to do.

HTH,
eric

-- 
: Eric S Fraga via Emacs 27.0.50, Org release_9.1.1-78-gfbf47c