When an individual is charged with underaged drinking, one of the collateral consequences is the suspension of license privileges. The license suspension occurs regardless of whether or not you participate in a pre-trial diversion program. The only way to prevent your license from being suspended is to obtain an acquittal or have the charge changed to another offense which does not carry a license suspension as a collateral consequence.
There are technical defenses to an underaged drinking citation. You should consult with an attorney.