Unfortunately there is no way to provide super user access to an entire group today. It must be done one user at a time. There is a feature request to add this in a future release. You could do it programatically to make it a little easier, see the section "How to make a certain user a Hue admin"
http://gethue.com/password-management-in-hue/
You could create a list of users and iterate through them in hue shell. Make sure to set HUE_CONF_DIR=/var/cloudera-scm-agent/process/id-hue-HUE_SERVER where id is most recent. ON CDH 5.5 and above you also have to set:
export HUE_IGNORE_PASSWORD_SCRIPT_ERRORS=1
export HUE_DATABASE_PASSWORD=huedatabasepassword
Hope this helps.