The responsibility that the average college student will have as an educated person to the rest of society is to use the education they are earning for public good and the advancement of society as a whole because society helped them to get the education by funding public schools.
People who get an education are set apart from the rest of society because they are capable, in general, of achieving more and therefore adding to society more. Educated persons are more likely to get a well-paying job, and therefore they pay taxes to help all the wonderful programs our government has created to help poor people. .
Also, making the country richer by having a good job as a result of an education is good because it helps the government to pay for more people's educations in turn. It is an investment that builds on itself, the government helps pay for one education and that person's education helps pay for more educations, and so and so forth.
Society expects college-educated persons to be the leaders and "doers" of society. The part of society that does not have an education expects those who do have an education to lead them. Certainly Aristotle meant that the people who are naturally leaders are those who pursue a higher education, and those who do not are those who naturally need to be led. There needs to be leaders and there needs to be followers, he states, this includes leading positions from president of our nation to the leader of the local community's homeowners" association. People with an education have this responsibility to lead portions of society because they owe society for their education. Also, because educated persons are the most likely to be good leaders, that is where they should be contributing to society.
An educated person expects of themselves success in society: the ability to get a well-paying job, the ability to lead, and the ability to simply carry on an intelligent conversation about a wide range of topics.