Andrew Lloyd Webber's musical "Cats" will be presented May 3-8, 1988 at the Orange County Performing Arts Center in Costa Mesa. These dates originally were announced for the musical "Me and My Girl," but producers of that show have revised its national touring schedule. Attempts are being made to reschedule "Me and My Girl" at the center during the 1988 season, according to a center spokesman. New dates are expected to be announced soon. The Los Angeles play dates of "Me and My Girl," however, remain unchanged: Jan. 12 through Mar. 5 at the Pantages Theatre.