What particular plane are you interested in? there are 3 different planes on that page.. I'm guessing you want the Top plane? The color of that plane is PC10 like the others on that page. Both the right and left side of the plane should be the same with the same lettering and graphics. The bottom of the plane wings will be Natural Linen in color, most likely the entire fuse will be PC10 but I'm not sure about that. As you can see by the picture the stab and fin are white as are the wheel covers.
Sorry I don't have any more info on that particular plane. I have several sources for the SE5a but the information I have on that plane is the same as yours (the windsock book).
I hope you don't me posting a picture of my SE5a. Its the bottom scheme, I reproduced the French finished SE5a scheme of that plane which is a little different (a later version of that plane).