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Often you can just move your entire hand. You move your forearm so that your hand has been moved one key. Or two keys. You just 'jump' to the next group. You can see an example of this in this finger gym.
A different way to expand a group of 5 keys can be seen in the video on this page. You step over your thumb with your index finger. In music language this is called 'thumb over'. By placing your index finger over your thumb, you end up in a new group of keys. Don't twist your wrist too much but keep your hand relaxed. If you were to try the same technique with your little finger, you would have to turn your wrist a lot. That's why we call it thumb over.