<｜begin▁of▁sentence｜>### Instruction:
As a youth counselor, imagine that while working with a group of students, you want to visually represent their social network using a graphical tool. You decide to use Plotly, a popular graphing library, and the PlotlyVerticesDrawer class to draw the social network with a 'kk' layout and the 'viridis' palette. How do you visualize the vertices using this class in order to help the students better understand their connections within the group?
### Response:
import igraph as ig
import plotly.graph_objects as go

# Create a graph
g = ig.Graph.Tree(5, 2)

# Generate layout
layout = g.layout('kk')

# Instantiate the drawing handler
fig = go.Figure()
vertex_drawer = ig.PlotlyVerticesDrawer(fig, palette='viridis', layout=layout.coords)

# Draw vertices
for idx in range(len(g.vs)):
    vertex_drawer.draw(visual_vertex={'color': idx, 'size': 10}, vertex=g.vs[idx], point=idx, coords=layout[idx])

# Show the plot
fig.show()
<|EOT|>
