In case you're still looking: I don't think I've ever seen a poster with the whole human genome's worth of pathways on it. There's still the Roche pathways posters (http://www.roche.com/media/roche_stories/roche-stories-2013-07-22.htm) and the various human genome posters (some of which used to be free - I remember ordering this one almost ten years ago: http://web.ornl.gov/sci/techresources/Human_Genome/posters/chromosome/index.shtml). One of the Circos software package example images (http://circos.ca/intro/genomic_data/) may also be along the lines of what you're looking for.