You might try emailing the person who posted this list of burials:
http://files.usgwarchives.net/tx/grayson/cemetery/lewiscem.t...Or maybe one of the people who contributed Lewis Cemetery burials to findagrave:
http://www.findagrave.com/cgi-bin/fg.cgi?page=gsr&GScid=...From the photographs there, it doesn't appear to have been kept up very well.