I used Macromedia Fireworks and printed it in landscape mode. Fireworks automatically rolls over to a new page when printing if the file is too big for one page. Then I just taped them all together.
If you don't have this program, you may be able to get a similar effect if you set your printer to "Banner" mode.
Another option would be to use a graphic program and crop the file into printable sized sheets (letter is 8.5 x 11, but most printers won't print all the way to the edge so 7 x 10.5 is pretty safe) then cut and tape the finished product together.