Hiring process: The salary turned out to be very low compared to the tasks after joining, how do I quit gracefully?

Before quitting you need to discuss the same with your supervisors. Make them understand that the Tast is not such that one person can do. Also, back your stance with proper data i.e your daily routine. Then also if they do not uderstand tell them the challenges and how it is affecting the quality of work. Thereafter, you can take your resignation further in a peacefull manner with a grace.