Hello, Don!
Do you understand that means " " ?
Since every number divides itself, your diagram is correct . . . so far.
But you missed a few others . . .
. . 2 divides 4, 2 divides 6, 2 divides 8.
. . 3 divides 6.
. . 4 divides 8.
You should have arrows indicating those pairs, too:
.