Before making the move to Cedar Park, Texas, he served as head coach of the Idaho Steelheads, the ECHL affiliate of the Dallas Stars, from 2015 to 2019. Over that span, he amassed a 166-91-31 record in 288 regular-season contests and led Idaho to three consecutive 40-win seasons. Graham guided the Steelheads to the Kelly Cup Playoffs in all four of his campaigns at the helm, recording a 14-20 record in 34 postseason contests. He helped continue the club's streak of qualifying for the postseason, which is the longest active postseason streak in professional hockey. Prior to being appointed head coach on Aug. 7, 2015, he held the position of assistant coach during the 2013-14 and 2014-15 seasons after serving as a player/coach in the 2012-13 campaign.