Resources from the field of Speech and Language Pathology can be extremely useful in developing these social literacy skills. You may nave a Speech/Language clinician who is a part of the team who you can work with and get other ideas for how to support this work. (In the same way that you might tutor a student with the support of a teacher, you may work on social interaction with the support of the a speech/language clinician.)
Another suggestion for developing social literacy is including the student as an assistant teacher in ASL instruction for their peers. For some students who are hard of hearing or use a cochlear implant, it may develop a higher regard for the use of sign language and provide a greater benefit for having an interpreter as part of the educational team. Additionally, it can help provide a role for the student that needs to focus on taking turns within the activities and clue students in to the ways that people need to wait for their turn.