The paint code will be on the tag that contains all of the other vehicle
specifications codes.  I don't know where that is located on a SantaFe, but
common places on other vehicles include, inside the glove box, on a door
jam, in the spare tire area, or under the hood.  The dealer will easily be
able to point out the paint code to you.  As well, most good suppliers of
paint for aftermarket autobody shops will be able to point it out, as can
any body shop.

You should probably seek out one of these sources as the codes are typically
quite cryptic and if you are not terribly familiar with these things, you'd
just be frustrated figuring it out on your own.