ShapeDefaults.hover

<div id="diagram"></div>
<script>
  $("#diagram").kendoDiagram({
    layout: "tree",
    shapeDefaults: {
      hover: {
        fill: {
          color: "pink"
        }
      }
    },
    shapes: [{
      id: "1",
      content: {
        text: "Monday"
      }
    }, {
      id: "2",
      content: {
        text: "Tuesday"
      }
    }, {
      id: "3",
      content: {
        text: "Wednesday"
      }
    }],
    connections: [{
      from: "1",
      to: "2"
    },{
      from: "2",
      to: "3"
    }],
    connectionDefaults: {
      endCap: "ArrowEnd"
    }
  });
</script>

<div id="diagram"></div>
<script>
$("#diagram").kendoDiagram({
    shapeDefaults: {
        hover: {
            fill: {
                color: "#ffcc00",
                opacity: 0.8
            }
        }
    },
    shapes: [{
        id: "1",
        content: { text: "Hover Me" },
        x: 100,
        y: 20
    }]
});
</script>