You can share diagram by emailing your team a direct link to a specific document. Alternatively, you can set up a shared folder everyone in your team has access to and simply save files you want to share in this shared location.
Shared folders have to be set up by your license administrator for a multi-seat or enterprise site license.
They can login to your organization's account and in the section to manage your license, they can choose to "Create Shared Folders."
They can also set up groups for your organization. After putting users in groups, they can give specific groups access to specific shared folders.