The mainboard does have a PCI-E x16 slot, but since it's micro-ATX form factor, I doubt there's a card that will even fit in the case. Apart from that, there's only a 250 watt power supply inside, which won't be enough for such a card. And then there's the problem that the processor and the rest of the components would probably slow the card down anyway, because they can't keep up with it.
I don't want to rule out the possibility of upgrading the PC with a graphics card, but it's difficult to figure out how much power it might consume (I'm guessing 50 watts at most, if not less, so there's not much to go on) and whether it's worth it.
Complete PCs are usually built in a very minimalist way and therefore don't offer enough room for upgrades. Usually only a graphics/RAM upgrade is possible and only if the PC was designed to be relatively powerful from the start.
