Network graph plot properties

I am using the digraph class to create a network. Currently, I can modify the color, marker shape and size, and the coordinates of the nodes.

p = plot(actionGraph);
p.MarkerSize = 10;
p.Marker = 'd';
p.XData = [x1,x2,x3];

I want to modify the font sizes and the position of the node labels. How do I do this? I can't seem to be able to find the digraph plot object properties that will allow me to modify these.