Transit Windsor runs ten "extra" routes to Vincent Massey - six in the morning and four in the afternoon. The extras are designed to reduce the load on the regularly-scheduled public buses and carry students directly to school.
The Dominion 5 and South Windsor 7 routes run in close proximity to Massey as well. More info can be found on Transit Windsor's official site (External Link).
The schedules are posted here for your convenience, and are published by Transit Windsor.