Guild space is ranged through different ways.
The main system to system travel is the portal projector. These link various star systems along the trade route with each other, and why the Guild haven't properly discovered sol, yet. These need codes for travel whjich are only provided via Guild ambassadors or officials.
Within the System special rings called 'FTL rings' are used to link each planet and major sectors of the system together. These however are linked via beacons which are easily disrupted thanks to special pirate technology used. There are major offences that the Guild places up against this practice.
Capital ships simply move using their built in FTL and portal drives. It's only the smaller ships that use the rings and projectors.