Welcome to the forum Michael J.
Yes you can open carry.
In fact, you can open carry without having a permit at all. I don't have a permit, and I open carry all the time.
The CCW permit does not limit you in any way, it just allows you to conceal as well if you so choose.
There is no law that says "Open carry is legal." It is legal simply because there is no law against it.
The old Attorney General website used to mention in the FAQ that it was legal. You can find itusing the internet archive at http://www.archive.org/index.php for http://ag.state.nv.us/if you look at the older pages. Note that most of these pages predate the state preemption laws which make it so that localities cannot make firearms regulations harsher than the state. The only rules localities can make are those concerning the discharge of firearms, and the registration system of clark county was the only grandfathered rule.
The Nevada laws concerning concealed carry (and the permit system) can be found here. There is nothing written there that would restrict a permit holder from carrying openly.
NRS 202.350 is the law that makes it illegal to conceal a handgun without a permit, and also does not apply to handguns which are not concealed.