Change range of data acquisition system
You're in fairly rarefied territory with voltages in that range, and you'll get some mediocre DC specs and high prices along with a lot of power consumption. 

For example, if you use +/-36V supplies with 32 OPA454 chips, you'll have 4mV Vos maximum, and total power consumption typically in the 7W range (which won't help the offset voltage drift during warm-up). That doesn't count the power consumption of the dividers on the op-amp outputs. The LTC6091 is another possibility, but the chips alone would be in the $400 USD range. 

Be careful of the loss in bandwidth with using dividers (with or without the op-amp) if that matters at all to you. For example, if you used 200K/100K dividers, divider input impedance would be 300K and output impedance of the divider 66K so the settling time would be in the 150us-200us range. Error due to that divider output impedance should be more than acceptable (66K/10G * 2^16 = 0.4 LSB). 

You might want to consider just buying a more appropriate data acquisition subsystem.