Substructures belonging to the maximal subgroups of the automorphism group:
a) A 4-coclique. There are 5 of these, forming a single orbit. The stabilizer of one is S4, with vertex orbit sizes 4+6. The induced subgraph on the 6 is 3K2.
b) A split into two pentagons. There are 6 of these, forming a single orbit. The stabilizer of one is 5:4, with vertex orbit size 10. There are 12 pentagons, with stabilizer D10.
c) A vertex. There are 10 of these, forming a single orbit. The stabilizer of one is 2×S3, with vertex orbit sizes 1+3+6.