Maybe by using template=volleyball in schordcode. But I think that is default when you save your volley league.
[matches league_id=9 template=volleyball mode=]
BTW.
Do you know how to configure plugin to correctly make volley standings (win 3:2 = 2 points and lose 2:3 = 1 point instead of 3 points for any win and 0 points for lose).