Since it's a top down raglan, you could probably just use the same pattern but stop increasing sooner to make a smaller sweater. KWIM? If you look at similar patterns (see knitqueen's link), it should give you a feel for how to adjust for fit.
Another thing that you probably already know, but just in case (and for other folks out there who are reading this who don't know)... 36" is probably the finished measurement, not the wearer's bust size. Depending on how much ease you want, it might be an okay fit for someone with a 32" or 34" bust.