Precision voltage divider
At the input you can use a voltage divider network 1:10, like http://www.caddock.com/Online_catalog/Mrktg_Lit/TypeT912_T914.pdf, then you will have 3.2V from divider at 32v input and you have to amplify with factor 1.5625. So, 1+Rf/Ri = 1.5625; Rf/Ri = 0.5625 you do this with choosing fixed precise resistors, low TCR.