The Operations Center Server Docker Cloud provides you the ability to create a Docker cloud in CJOC. From there, there is nothing special to be done on CJOC side.
Basically, the way you configure it is the same you would configure it in case you are running a Standard Jenkins instance + Docker plugin. Docker itself provides you the ability to use swarm.
In this link you can see that the swarm is actually done in Docker side. Docker plugin, and Operations Center Server Docker Cloud just provide the ability to work with this Docker feature, but this is transparent from the user point of view.
The way the Operations Center Server Docker Cloud plugin needs to be configured is documented on our documentation webpage.