Usually, it may not be possible to do fancy graphical operations within a general purpose software like Scilab. There are tools designed for this purpose, Gnuplot being an example. Spoken Tutorials on Gnuplot are available here: https://spoken-tutorial.org/tutorial-search/?search_foss=Gnuplot&search_language=English. Using this software, you can do many more fancy things as well. Of course, you can continue to use Scilab for computations.
You may refer following documents regarding your query: