Saturn is at its highest above the southern horizon just after sunset. It is easy to spot because it pairs very nicely with the bright star Spica almost directly below it. Look at the pair very carefully. Can you see that Saturn (the “top” star in the pair) has a slight yellowish color and Spica (the “bottom” star in the pair) has a slight bluish color?
Still can’t find the pair? Here’s another way: find the handle of the Big Dipper follow the arc of the handle (away from the dipper part) and soon you’ll arrive at a very bright star. This is Arcturus. Then keep following the arc and the next bright pair you arrive at is the Saturn/Spica pair. Remember the phrase “follow the arc to Arcturus and speed on down to Spica.”
If you get a chance be sure to view Saturn through a telescope; it never fails to disappoint even in a small scope. Here’s a picture I snapped on 5/13/12 through the Celestron NexStar 130 mm reflector: