Unless you have access to reagents needed to produce H2S, as well as a glass gas mixing apparatus, you will not be able to do an accurate calibration. But what kind of accuracy do you need? Do you want to know if H2S is present, or are you doing some sort of measurements where you need the answer in fractional ppm?
If I were trying to calibrate a hydrogen sulfide sensor, I'd fart into a plastic bag and measure that. Human flatus contains about 0.1 ppm of H2S, give or take depending on diet. You don't really want to go messing with higher concentrations unless you are a professional, and have professional equipment for handling it.