If you wish to keep the voltage in the 30 volt or under range you could use a regulator on the negative rail and loose a few volts that way. If the current of the whole shebang is constant, ie class A, then a simple cap multiplier would work to shave off a couple or three volts too.
I doubt you'll have a problem working with 32 volts though. Like Ian said, just check the dissipation etc. on the transistors you use.
Edit: take a peek at what voltage is where and just be sure you orient your electrolytic caps the correct way, it's possible you may need to reverse a couple from how they're depicted on the scheme but, without a full schematic, who knows?