International Fellowship of Evangelical Students (IFES) Worldwide
Here is the website of IFES an affiliation of over 150 member movements worldwide (InterVarsity USA and Canada are two of the members) with ways to find out how to serve as a volunteer, campus worker or missionary.
There are numerous ways that a graduate can serve back home or in other countries of the world, either as a volunteer, in direct ministry to students as a campus worker, or as a missionary in a cross-cultural setting.
IFES is an excellent place to begin looking for such opportunities back home or in other countries, and to begin praying relevantly for current concerns. The home page of IFES: http://www.ifesworld.org/default.asp will inform you of what is going on in these countries and how to pray effectively.