First, check out the National Endowment for the Arts (www.nea.gov) and the National Endowment for the Humanities (www.neh.gov). They may have grant programs relevant to your need.
You'll also want to check out companies that do business in your community and that have an interest in the arts, the Hispanic population, or both. Companies may support your work through their corporate giving programs.
Contact your local community foundation. It may be willing to help, but even if it can't make a grant, it is likely to be a great source for ideas and information. For a project such as this, individuals may be a primary source of support. Look for people of means in your community who are of Spanish descent and ask them for help and for ideas.
Do some research, ask around. Try to locate other theatre groups that have received funding for similar work. Once you find them, contact them and ask for advice.
When you use The Grantsmanship Center’s funder databases, or any other database, be sure to think broadly about the key words you’ll use in the search. Don’t focus entirely on one key word, such as "Hispanic," but branch out and also use words such as drama, theatre, accessibility, under-served, literature, Shakespeare, etc. When we limit our search to just one specific term we are less likely to bring up all the possibilities.