<｜begin▁of▁sentence｜>### Instruction:
Given a graph with vertices ['A', 'B', 'C', 'D'] and edges connecting them, how do you create a plot in igraph using a custom color palette for the vertices with the help of the AbstractVertexDrawer class?
### Response:
import igraph as ig
from igraph.drawing import plot
from igraph.drawing.colors import PrecalculatedPalette

# Define the vertices and edges
vertices = ['A', 'B', 'C', 'D']
edges = [(0, 1), (0, 2), (0, 3), (1, 3)]

# Create the graph
g = ig.Graph(edges=edges)
g.vs['name'] = vertices

# Define a layout for the graph
g_layout = g.layout('kk')

# Define a palette for coloring vertices
palette = PrecalculatedPalette(['red', 'green', 'blue', 'yellow'])

# Use the default plot function, which uses AbstractVertexDrawer internally
plot(g, layout=g_layout, vertex_color=[palette.get(0), palette.get(1), palette.get(2), palette.get(3)], target='graph.png')
<|EOT|>
