Likewise I searched in vain for one of these diagrams. It sounds interesting but the 'GUI' is just two text windows and a toolbar that look straight out of 1996 which doesn't bode well.
I mean, the first question in the FAQ is about those diagrams so maybe it should include an example of one? Usually when I'm evaluating a new project I am not so interested in figuring out what it can do if that isn't clearly communicated up front.