how to get 'sightseeing bus' from beverly plaza htl in Macau

I do not think you need to need to take the sightseeing bus if you visit there.
From your hotel to your tower, you can take a taxi to reach directly. It is not very far between them. Then from the Tower, you can take the free shuttle bus to reach City of Dream. Get off the bus, you can find the Venetian is on the other side of the road.
For going to Senado Square, you can walk to reach.
The local sightseeing bus starts from the Port and ends there and the bus only passes some local famous attractions.