When you try SolrCloud for the first time using the bin/solr -e cloud, the related configset gets uploaded to zookeeper automatically and is linked with the newly created collection.
The below command would start SolrCloud with the default collection name (gettingstarted) and default configset (data_driven_schema_configs) uploaded and linked to it.
here is the path for the config files
../solr-5.1.0/server/solr/configsets
if you don't mention the configset, the default is "data_driven_schema_configs".
So you will find your config files here
../solr-5.1.0/server/solr/configsets/data_driven_schema_configs