how to defined the color myself in paga node ?

[honghh2018]

Hi developer,
I want to defined the color in paga plot node?
and i can defined it properly.
how to define the color that i want in page node plot
color_map_dict = {}
cluster_name = adata.obs['cluster'].unique()
if len(colors)>0:
for i in range(len(cluster_name)):
color_map_dict.update({cluster_name[i]: colors[i]})
else:
for i in range(len(cluster_name)):
color_map_dict.update({cluster_name[i]: cluster_name[i]})

adata.obs['cluster_color'] = adata.obs['cluster'].map(color_map_dict)

sc.pl.paga(adata, color='cluster_color', ax=axes[0, 0], show=False)
it not work for this code
any advice would be appreciated.
Best,
hanhuihong