Well, you could use knitters graph paper to graph the pattern yourself. here are some sources
http://www.tata-tatao.to/knit/matrix/e-index.html
http://www.sweaterscapes.com/lcharts3.htm
http://incompetech.com/graphpaper/asymmetric/
http://www.thedietdiary.com/knittingfiend/KnittersGraph.html
or you can use one of these cross stitch programs to convert the picture into a graph. remember that knitting is slightly wider than it is tall, so you need to adjust the graph accordingly.
http://www.picturecraftwork.com/en
http://www.tamemymind.com/blog/2007/01/25/turn-photo-graphic-image-into-chart.php
http://blog.atimes.net/wp-content/themes/default/TUTORIAL_graphs.pdf
http://www.cross-stitch.szm.com/