Be Advised: Classified, FOUO, and PII Content is Not Permitted
Probably one of the best SysML guides, not MagicDraw/Cameo specific
https://www.nomagic.com/support/quick-reference-guides
Also good is this one:
PDF
from the following website. (Not reachable from NMCI at this time)
https://model-based-systems-engineering.com/
Link to older version:
http://model-based-systems-engineering.com/wp-content/uploads/2012/03/sysml_sheet.jpg