download the demo of the style converter from
http://www.emc-software.de/taste/ a cheaper option would be the upgrade to the style conversion disk supplied with the 6500, which now includes Yamaha conversion with the others.
Check out the Yamaha Users Group, I'm pretty sure I've seen the 5700 presets in the past, though they may have had to take it off the site, in which case mail them and I'm sure someone can help out. A lot easier than having to save them all yourself.