BigSisterenter the name of a group (e.g. SERVERS) or a status item (e.g. srv1.conn)
bsvisio example.VDX > example.cfg
%image example.cfgto your bs-display.cfg
The BigSister Visio stencils can be downloaded from https://sourceforge.net/projects/bigsister/files/Big%20Sister/1.12/BigSister.vss/download. Do not expect too much, the file merely contains the two status stencils. You will still need some nice stencils for the devices you want to appear in your map.