How should I cite an invited paper?
No, cite it as you would any other paper. You do not mention the paper status (“invited paper”, in your case; “review paper”, “perspective”, “editorial”, etc.) in the citation, unless that is formally part of the title (which it typically is not), or unless the citation style explicitly calls for it (IEEE does not, and I know no citation style that does).

In IEEE's templates and LaTeX classes, the only place which mentions invited papers is a command to indicate when your paper is an invited paper (here for IEEEtran):


  Special paper notices, such as for invited papers, can be declared with:  

\specialpapernotice{(Invited Paper)}