Your parents have to qualify for the visitors' visas on their own merits, by proving strong ties to their native Hindustan and convincing the consul of their intention not to remain permanently in the U.S. Attending their child's graduation is a good one, but visas will not be approved unless can demonstrate "substantial ties" to home country and intent to return after temporary visit.
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Nothing is needed. If you want them to take it upon themselves to prove the reason for the trip to the US consulate official, you can furnish them with letters form both the school and employer confirming the requisite facts.
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Your parents will just need to apply for a visitor's visa. It is good to present a letter from school confirming your graduation and your letter explaining why you want your parents to be in the US.
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