Well, there are a lot of different datasets resources:
https://aminer.org/data
https://networkrepository.com
But I will go with the one that relates to biology. The link below guides you to access different datasets in Biology:
http://networkrepository.com/bio.php
There are a lot of datasets that you can use. But here I used a biology dataset. This dataset is a category of Sparse network contains 453 nodes and 2K edges. The vertex types are substrates and the edges type are based on metabolic reactions. The format is the undirected graph and unweighted edges.
The name of the dataset is Celegans.