In the future, please follow Community Questions Guideline #14.
The config is missing the triggers key and the event trigger is improperly indented:
alias: New automation
description: ""
triggers:
- trigger: event
event_type: zha_event
event_data:
device_ieee: a4:c1:38:4e:4e:9d:ad:fa
command: toggle
conditions: []
# the rest of it...