如何将边的二部列表转换为NetworkX中的图，其中每组节点都有重叠的标签？

import networkx as nx

G = nx.DiGraph()

edges = [(1, 'A'), (1, 'B'), (2, 'B'), (2, 'C'), (3, 'C'), (3, 'D')]

for edge in edges:
    group, label = edge
    G.add_edge(group, label)

node_labels = {'A': 'Group 1', 'B': 'Group 1', 'C': 'Group 2', 'D': 'Group 2'}

pos = nx.spring_layout(G)
nx.draw_networkx(G, pos, labels=node_labels, with_labels=True)

import networkx as nx

G = nx.DiGraph()

edges = [(1, 'A'), (1, 'B'), (2, 'B'), (2, 'C'), (3, 'C'), (3, 'D')]

for edge in edges:
    group, label = edge
    G.add_edge(group, label)

node_labels = {'A': 'Group 1', 'B': 'Group 1', 'C': 'Group 2', 'D': 'Group 2'}

pos = nx.spring_layout(G)
nx.draw_networkx(G, pos, labels=node_labels, with_labels=True)