(After receiving countless suggestions from users like Sojourner, Wilik, and EngrStudent, I have come up with a solution to a cloud city on Saturn.)
So, I ran a few calculations on Air Density Calculator, and found out that it is possible to use thin air (Yes, nitrogen-oxygen "air") as a lifting gas on Saturn. The lift gas used is "Earth Air" at 0.01 bars. As the density of this air is lower than that of the hydrogen atmosphere surrounding it (0.017631kg/m³ vs 0.08375kg/m³), the city gets lifted to a suitable altitude. The story goes as follows:
In the late 2030s-2040s, humans found out that Saturn has closer gravity to Earth, closer than even Venus (Venus's gravity is 10% lower than Earth, whereas Saturn's is just 6% greater). So they send manned missions to Saturn to colonize it. They build zeppelin cities using the calculations given above. They set up fusion reactors for energy, and make algae panels for oxygen, and setting up stables for the imported livestock for food and pets, exhausting the water-supply given to them on board. One problem arises however- Pressure
Would it be possible to use Aerographene, coated with Titanium as the hull material, so as to prevent getting crushed by atmospheric forces
-I choose 0.01 bars as the air pressure, as the air at 30km altitude is 0.01 bars of pressure, and is less dense than even hydrogen.
-Livestock consists of sheep, cattle and goats with a few pets.
-Human population is around 100,000, with 200,000 pets, assuming that 1 person has 2 pets. Livestock population is about 70,000.
-Pets are mainly cats and dogs, though you may add fish and even exotic pets if you want to.
Concept art: Image Credits:Medium
More clarifications: NO, the pressure inside the colony isn't at 0.01 atm. This would kill all living beings. What I meant, is the Balloon like structure that is supporting the colony has the air pressure of 0.01 bars.