A.I wasn't quite sure of the answer to your question, so I looked it up and got several answers from different books. Both books agreed that you shouldn't use apostrophes unless there was a chance of misreading. The Gregg Reference Manual specifically listed " dos and don'ts."
The best answer, I thought, was in Keys for Writers by Ann Raimer. This book advised italicizing the word themselves but not the final -s.
The Dos and Don'ts of Snowboarding. The italics signal to the reader that words other than nouns (do and don't) are being used as nouns in this sentence.