Social Stories are a great teaching tool not only for students with special needs, but also for any child that needs a little help internalizing the many behavioral expectations that we throw their way in school.
The value of a social story is in the simplicity of the language and the corresponding visuals. You will notice that all of my social stories have blank boxes above the words. In these boxes either insert or affix a picture of the student modeling the behavior described in the words, or have them draw a picture to accompany the words. Both approaches will foster a sense of ownership and pride and will result in more time spent reading it.
"Staying With the Group" is great for kids that struggle with understanding how important it is to stay with the group when outside of the classroom setting. I suggest on each page having the student draw a picture that details what it looks like to stay with the group (taking a picture would be great too). This picture will then act as a visual model for where their body should be in space in various situations outside of the classroom (in line, outside, on field trips).