Hello Deepak,
It is not currently possible to configure the default node colour, size, icon or line colour, weight, etc based on attributes of the data - this is a feature we are planning for the next release of SAS Visual Investigator.
Today, however, administrators can configure node decorators/annotations to be displayed based on data - the administration guide provides details on how to configure these (search for node annotation in the documentation for details).
End users can manually edit the node and link styles via the node properties and link properties tools panel in the network view - any changes made here are local to that specific network view and workspace.
Thanks,
Susan