Because the graphic novel (& comic & manga) is a medium as opposed to a genre, you can find these materials all through the FGCU collection. A large proportion of them are found between the call numbers PN 6710 through PN 6790. This section includes titles about Wonder Woman and Vision, memoirs like Fun Home and Persepolis, adaptations of The Lottery and Anthem, and manga such as Akira and Tokyo Ghoul. However, there are more to be found!
If you know the title that you're looking for, the easiest way is to do a search in the catalog.
Another option, if you just want to browse titles, is to search "graphic novel" under subject heading. This will also find academic titles catalogued with that subject heading.