So many students struggle with coping with anger. The best thing to do is teach them how to! This can be used as both a social story and checklist. I have students read through the checklist and then go through each step.
The student in the example had very explicit steps. You can alter it to fit the needs of your students. An extension to this activity can be a video model. You can record the student going through all the steps. The student can watch it on a daily basis to reinforce the behavior.