There are (at least) two configurations associated with H. S. M. Coxeter.

A configuration sometimes known as "the Coxeter configuration," but more clearly termed the "Nauru configuration," is the configuration illustrated above whose Levi graph is the Nauru graph.

The Coxeter configuration is the configuration illustrated above (Boben et al. 2015, Fig. 5(b)) whose Levi graph is the Foster graph (not the Coxter graph).

More things to try:

Weisstein, Eric W. "Coxeter Configuration." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CoxeterConfiguration.html