Sumit had a good suggestion if you want to use colors and marker shapes. If you want pointers like arrows, then you can use the annotation() function:
annotation
Create annotation objects
Syntax
annotation(annotation_type)
annotation('line',x,y)
annotation('arrow',x,y)
annotation('doublearrow',x,y)
annotation('textarrow',x,y)
annotation('textbox',[x y w h])
annotation('ellipse',[x y w h])
annotation('rectangle',[x y w h])
annotation(figure_handle,...
annotation(...
Of course you'd need the x,y coordinates of the arrow endpoints first.
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