The IAS officers may get following facilities.

They can stay in Government Guest House/Circuit Houses at nominal rates.

They can get protocol from the local IAS/IPS officers to facilitate your travel.

They often get VIP Darshan(Officially) at many places(like Tirupathi Balaji Temple)

They can travel in official/red light cars when they are on official duty.

They don?t have to stand on the queue as the local protocol officers take care of them.