Unless you have a cutaway on the ukulele, you should be able to re-string it for left-handed play. There are several threads here that explain how and the pros and cons of doing so.
If you are looking for left-handed chord diagrams, I wrote a website that generates chord diagrams using the chord library from a great program called "Chordious" written by Jon Thysell, who is also a member here at Ukulele Underground.
http://chordiousweb.gear.host
Select "Ukulele" from the list of instruments.
Select the tuning of your instrument. (probably standard C6 tuning - GCEA)
Select the chord you want.
Select the chord quality that you want (i.e. Major, Minor, Dominate 7th, Diminished, etc...)
At the bottom of the options section, Look for the check box marked "Mirror Results" this will generate the left-handed chord diagrams.
Click the button marked "Find Chords"
The other options you can ignore for the time being, but feel free to play around with them.
NOTE: The chord diagrams that are generated are based upon the rules of music theory. Some of the chord diagrams that are generated are NOT finger friendly! So even though the chord is correct musically, it won't be playable. The four string instruments aren't so bad (ie,e Ukulele, Mandolin, Mandola, etc...) but the six string instruments can create some weird diagrams.
P.S. Jon does know about the project and has given his blessing on it. I have given him full credit for his work on the core libraries and lots of links to the main "Chordious" application which I highly recommend if you want to save chord diagrams for your own use.