[R] Package for "design graphs"

[m@dsmh m@iii@g oii gm@ii@com]

Hi,

in our course littrature a "design graph" of two factors R and S with
associated maps s : I -> S and f : I -> S where I is some finite index
set, is a graph with factor labeles as vertices and lines f(i) to s(i)
for all observations i in I. Is there a package on CRAN that can draw
graphs like this automatically?

I haven't been able to find anyting by searching.

Regards, Mads