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Feynmann diagram for strong interaction

As I expect most A Level Physicists are, there is good coverage in the course of Feynmann for weak interactions. This stuff is really an undergraduate question:

I am not able to draw/find/understand Feynmann diagrams for strong interactions between composite particles (nucleons etc.)

I understand the Feymann for a quark's colour change, ie showing how the colour charged particles (quarks and gluons) interact.

But for example, I came across this interaction:
a proton and neutron approach, a minus pion is exchanged, and then proton becomes netron and neutron becomes proton. In quark terms, udd becomes uud whilst uud becomes udd. So surely if quark flavour changes (irrespective of whether colour does), then surely this must be a weak interaction? To be weak I would have thought that 2 W bosons of appropriate charge are exchanged?

So if someone could give a thorough explanation as to why this is strong, that would be most appreciated.
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