The Plot addon makes it now possible to define function colors in the module itself.
Now, in order to define or change the function color in Plot, it is enough to go to the “Expressions” section in the module’s menu and fill in the relevant field. In addition, it is possible to define or change function colors through a new command setPlotStyle(id, type, property, value), where id indicates the plot id, type is the element that needs changing (plot), property indicates the css property to be changed (color) and value defines the color itself, e.g. #00ff00.
To learn more, read the Plot detailed documentation, and watch its demo presentation here.