We investigate bipartite entanglement in a class of multiparty quantum states, the G-states, constructed from a group G, and we derive an expression for the von Neumann entropy. We show that for a special subset of such states, the G-homogeneous states, the entropy satisfies the area law. If G is a group of spin-flips, the G-homogeneous states are locally equivalent to 2-colorable graph states (e.g., n-GHZ, cluster states, etc). The advantage of our representation is a more compact description of these states in terms of a group of spin-flips G. As an example, we compute the n-tangle τ_n for 2-colorable graph states.