The boundaries between domains in single-layer graphene^,,, strongly influence its electronic properties^,,,,,,,. However, existing approaches for domain visualization, which are based on microscopy and spectroscopy^,,,,,, are only effective for domains that are less than a few micrometres in size. Here, we report a simple method for the visualization of arbitrarily large graphene domains by imaging the birefringence of a graphene surface covered with nematic liquid crystals. The method relies on a correspondence between the orientation of the liquid crystals and that of the underlying graphene, which we use to determine the boundaries of macroscopic domains.